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从实验和理论两方面研究了钨晶粒平均直径(?)<10微米的微细晶粒 W-Ni-Cu 重合金的形变与断裂、强度特性、物理性能、显微组织和断口形貌。微细晶粒 W-Ni-Cu 重合金具有明显的晶粒尺寸效应和缺陷效应,复杂的晶界有利于阻止裂纹的扩展,微细晶粒间形成的孔隙缺陷被限制在极小的范围内,有利于提高合金的强度、致密度及其均匀性。合金的强度特性取决于细晶强化和相面强化作用。实验表明,微细晶粒 W-Ni-Cu 重合金具有高强度、高致密度和高均匀性的特点。
The deformation and fracture, strength, physical properties, microstructure and fracture morphology of fine grained W-Ni-Cu heavy alloy with average grain size less than 10 μm were investigated experimentally and theoretically. The fine grained W-Ni-Cu heavy alloy has obvious grain size effect and defect effect. The complex grain boundary is good for preventing the crack growth, and the micro-grain boundary porosity defects are limited to a very small area. There are Help to improve the strength of the alloy, density and uniformity. The strength characteristics of the alloy depend on the fine grain strengthening and phase strengthening. Experiments show that the fine grain W-Ni-Cu heavy alloy has the characteristics of high strength, high density and high uniformity.